Separate browser source audio from output

[OuDayas]

Hi, im trying to separate the browser source audio from the main output device, so I can mute the browser source for example alert box, for me and the stream/video recorded. without have 2 tracks, 1 with the all pc output and 1 only with the browser source

 

[PaiSand]

 

[OuDayas]

View attachment 93464

View attachment 93465

I already did that, but it still double when I test it, it goes out throught the main output and the his output